Malicious PDF — malware analysis report

Static analysis result for SHA-256 d306dcbfec6cbd4d…

MALICIOUS

PDF

41.8 KB Created: 2020-08-13 21:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25ca4badef4e0c611b9395b78185242a SHA-1: 099b11375f3675915d8fc177df1a8851f7984070 SHA-256: d306dcbfec6cbd4d1403643f3c90f11221096e2af4b7cfd3983da364048f332a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.001 Command and Scripting Interpreter: PowerShell

The PDF document contains a malicious redirector link disguised as a free download for Spider Solitaire. It utilizes a link farm, with numerous links pointing to Shopify domains, to obscure the primary malicious destination at ttraff.ru. The ML classifier strongly indicated maliciousness, and the document body confirms the lure and the presence of the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=spider+solitaire+free++old+version
    • http://fujopojel.graceclt.com/uploads/1/3/1/4/131483147/4961619.pdf
    • http://files.watchrepaircentral.com/uploads/1/3/0/7/130740130/5517503.pdf
    • http://files.amitybrusharborchurch.com/uploads/1/3/1/4/131452799/wafup.pdf
    • https://cdn.shopify.com/s/files/1/0428/4124/3814/files/6466055092.pdf
    • https://cdn.shopify.com/s/files/1/0428/8797/0975/files/92661213484.pdf
    • https://cdn.shopify.com/s/files/1/0432/0978/5512/files/26419597873.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mojarugalemidim.pdf
    • https://cdn.shopify.com/s/files/1/0438/4423/9510/files/sedentarismo_en_nios.pdf
    • https://cdn.shopify.com/s/files/1/0430/9568/7328/files/understanding_analysis_abbott_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/3524/5216/files/algebraic_expression_worksheet_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/8804/4447/files/powuve.pdf
    • https://cdn.shopify.com/s/files/1/0443/0928/2972/files/interview_questions_and_answers_in_english_for_experienced_candidates.pdf
    • https://cdn.shopify.com/s/files/1/0428/9455/7351/files/tapixumiragejebegoriduzi.pdf
    • https://cdn.shopify.com/s/files/1/0451/7996/1493/files/all_assets_and_liabilities.pdf
    • https://cdn.shopify.com/s/files/1/0431/9451/5614/files/bemigulamujutizekosafi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000640d.bin
cded4cc603ff651c9b38e4865ddf951b85dc1b35914b0e0bf349113d6426a5cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x640D 5200 bytes
font_01_sfnt_off000075cf.bin
30f91f50e4b0cd087ff8b0ce8e3e45e15e67e447b1448bd9f71c8ca107f2557e
pdf-font-stream PDF embedded font (sfnt) at offset 0x75CF 10708 bytes